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The wheel of a car is of diameter 70 cm. The number of revolutions per minute must the wheel make so as to keep a speed of 66 km/hour will be?
  1. 300
  2. 400
  3. 500
  4. None of these
Explanation

Diameter = 70 cm

Circumference = pi _ D = 22/7 _ 70 = 220 cm = 2.2 meter

Speed = 66 km/hour = 66000 meter / 60 minute = 1100 meter/minute

Revolutions per minute = Distance covered in 1 minute / Circumference

= 1100 / 2.2

= 500


Last verified on 20-10-2026

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